Mother Substrate With Segmented Voltage Electrodes For Liquid Crystal Pretilt Control
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Solution Overview
Problem
Conventional liquid crystal displays (LCDs) face limitations in achieving improved visibility and response speed due to uniform pretilt angles of liquid crystal molecules in subpixels, which restrict lateral visibility and response speed.
Innovation Solution
A mother substrate for a display device is designed with different pretilt angles for liquid crystal molecules in two subpixels by using separate voltage application electrodes and a reactive mesogen-based alignment layer, allowing for distinct voltages to be applied across the subpixels, thereby differing their pretilt angles.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If uniform voltages are applied to two subpixels, then the manufacturing process is simple, but the visibility and response speed are limited
Solution Approach 1:
The voltage application electrode is divided into a first voltage application electrode and a second voltage application electrode that are electrically separated from each other. This segmentation allows different voltages to be applied to different subpixels, enabling different pretilt angles for liquid crystal molecules in each subpixel, thereby improving response speed and visibility without significantly complicating the manufacturing process
Solution Approach 2:
Different voltages are applied to different regions (subpixels) of the display panel. The first voltage application electrode applies a first voltage to the first subpixel while the second voltage application electrode applies a second voltage to the second subpixel, creating local variations in pretilt angles that optimize performance for different viewing directions and improve overall response speed
2Ease of manufacture
If uniform pretilt angles are formed in subpixels, then the alignment process is simple, but lateral visibility is restricted
Solution Approach 1:
The alignment process is segmented by applying different voltages to different subpixels during the pretilt formation stage. The first and second voltage application electrodes create different electric fields in respective subpixels, causing liquid crystal molecules to align at different pretilt angles, which improves lateral visibility by optimizing light transmission from different viewing directions
Solution Approach 2:
Different pretilt angles are created in different subpixel regions through localized voltage application. This local quality variation allows each subpixel to be optimized for specific viewing directions, thereby improving overall lateral visibility while maintaining a relatively simple alignment process using standard UV irradiation
3Speed
If different voltages are applied to subpixels, then visibility and response speed are improved, but the device complexity increases
Solution Approach 1:
The voltage application electrode is segmented into electrically separated first and second voltage application electrodes, allowing different voltages to be applied to different subpixels. This segmentation enables improved response speed and visibility while maintaining a relatively simple electrode structure that can be integrated into existing display panel manufacturing processes
Solution Approach 2:
The first and second voltage application electrodes serve multiple functions: they apply different voltages to create different pretilt angles for improved response speed and visibility, and they can be integrated with existing gate lines and data lines in the display panel structure, reducing the need for additional complex components
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This approach enhances both the visibility and response speed of the liquid crystal molecules by creating distinct electric fields across subpixels, improving the overall performance of the display device.
Implementation Method 1
In a method in which a prepolymer that is polymerized by light such as ultraviolet rays is used to provide the pretilt to LC molecules, each field generating electrode is applied with a voltage having a desired magnitude before ultraviolet ray exposure.
Implementation Method 2
The first voltage application electrode is applied with a first voltage, and the second voltage application electrode is applied with a second voltage different from the first voltage
Data Source
AI summary
A mother substrate for a display device includes: a first mother substrate and a second mother substrate including a plurality of panel regions and facing each other; a first contact electrode and a second contact electrode on the first mother substrate; a common electrode, a first voltage application electrode and a second voltage application electrode separated from each other and on the second mother substrate; and a liquid crystal layer between the first mother substrate and the second mother substrate. The first voltage application electrode is connected to the first contact electrode, and the second voltage application electrode is connected to the second contact electrode. The first voltage application electrode is applied with a first voltage, and the second voltage application electrode is applied with a second voltage different from the first voltage.